Key-fastener



(No Model.)

E. W. WAGNER.

KEY FASTENER. No. 291,434. PatentedJaJn. 1, 1884 UNITED STATES PATENT OFFICE.

EDWARD WILLIAM WAGNER, OF CHEROKEE, CALIFORNIA.

KEY-FASTENER.

SPECIFICATION forming part of Letters Patent No. 291,434,'dated January 1, 1884.

I Application filed October 20, 1883. (No model.)

"of Cherokee, in the county of Butte and State of California, have invented an Improvement in Key-Fasteners; and I hereby declare the following to. be a full, clear, and exact description thereof.

My invention relates to a new and useful key-fastener, the object of which is to secure the key Within the lock, in order to prevent it from being turned from the outside by any of those means known to and in use by those who seek unlawful entrance.

My invention consists ina sliding bolt seated within the lock-casing, and operated by means of a thumb-piece projecting through a slot in said casing, said bolt being adapted to engage with anotchin thebit of the key, as I shall hereinafter fully explain by reference to the accompanying drawings. I

Figure 1 is a side elevation of a lock, showing the key fastened by my device. Fig. 2 is a vertical transverse section of a lock with the bolt 0 in elevation and in engagement with the bit of the key. Fig. 3 is a view of the interior of a lock, showing how the bolt 0 engages with the bit of the key.

. .A is the casing of a common flat lock, having the hole a for the handle or knob, the keyhole 12, and the lock-bolt 0.

It is unnecessary to describe the mechanism of the look, as this may be of any suitable form. Inthe casing, just in front of the keyhole, is made an elongated slot, B. A bolt,O, lies within the casing just behind the slot, and has a thumb-piece, D, extending through it, whereby said bolt may be operated. The lower edge of this bolt rests upon the bottom of the casingas a guide, though I may seat it in any manner I find best.

K is thekey, having a bit, 70, in which any suitable slits or cuts may be filed, to adapt it to the particular description of lock used; but on its inner side is made a large notch, m,

adapted to receive the end of bolt 0. When the key is inserted and turned to shoot the lock-bolt, it must be turned far enough to allow its bit to project downwardly, in which position the bolt 0 may be slid to cause its end to engage with the notch m in the bit.

WVhen thus adjusted, the key cannot beturned from the outside or pushed out. To release it the bolt is drawn back.

I am aware that devices are known for this purpose which embody a sliding bolt adapted to engage with the key in some manner, to prevent its turning; but in these the bolt is seated on the outside of the lock or on the escutcheon of the key-hole, in guides especially prepared for it, and it engages with the key stem or shank. In addition to theextra work necessary upon these devices to make them operative, they are in the Way, and do not look well, besides not being very secure, by

engaging with the stem of the key; but in my device everything but the small thumb-piece is out of sight, and may therefore be made as cheaply as possible, besides being out of the way, and having a surer engagement with the bit than with the stem of the key. I do not therefore claim, broadly, a sliding bolt engaging with a key; but

What I do claim as new, and desire to secure by Letters Patent, is-

The lock-casing A,having aslot, and the bolt 0 within said casing, and having a thumb-piece projecting through said slot to the outside, in combination with the key K, having bit It, withanotch, m, with which said bolt is adapted to engage to prevent the key from turning, substantially as herein described.

In witness whereof I have hereunto set my hand.

EDWARD WILLIAM WAGNER. 

